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Finding the Fourth Proportional to 815.29, 1,124.76 and 520.48

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Solution

The fourth proportional to 815.29, 1,124.76 and 520.48 is: 718.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.29 : 1,124.76 = 520.48 : x
  2. Step 2: Convert to fraction form
    815.29/1,124.76 = 520.48/x
  3. Step 3: Cross multiply
    815.29x = 1,124.76 × 520.48
  4. Step 4: Simplify right side
    815.29x = 585,415.08
  5. Step 5: Solve for x
    x = 585,415.08/815.29
  6. Step 6: Final answer
    x = 718.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.